import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    x,y,h=MI()
    x*=1000
    y*=1000
    ans=0
    
    for _ in range(30):
        if min(x,y)>h:
            if x<y:
                if x>h:
                    x=x/2
                    h=h*2
                    ans+=1
            else:
                if y>h:
                    y=y/2
                    h=h*2
                    ans+=1
        elif x>h:
            x=x/2
            h=h*2
            ans+=1
        elif y>h:
            y=y/2
            h=h*2
            ans+=1
            


                
                    
    
                
    print(ans)
    
    
    


main()